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Effects of Mn2+ Distribution Controlled by Carboxylic Acids on Photoluminescence Intensity of Nanosized ZnS:Mn Particles

Published online by Cambridge University Press:  15 February 2011

T. Isobe ,
T. Igarashi  and
M. Senna
T. Isobe
Affiliation:
Department of Applied Chemistry, Keio University, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan. [email protected]
T. Igarashi
Affiliation:
Department of Applied Chemistry, Keio University, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan. [email protected]
M. Senna
Affiliation:
Department of Applied Chemistry, Keio University, 3–14–1 Hiyoshi, Kohoku-ku, Yokohama 223, Japan. [email protected]
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Abstract

Addition of methacrylic acid (MA) during preparation of ZnS doped with Mn2+ (ZnS:Mn) increased the photoluminescence (PL) due to 4T1-6A1 transition of Mn2+. According to X-ray fluorescence analysis and electron paramagnetic resonance spectroscopy, ion exchange between Zn2+ and Mn2+ through a preferential dissolution of Mn2+ was promoted by acidic additives. This caused that Mn ions were isolatedly incorporated into ZnS. The X-ray photoelectron spectra show that the intensity of S 2p3/2 peak due to S6+ increased relative to that of S2- by virtue of carboxylic groups. The intensities of PL peaks at 450 and 580 nm, corresponding to polymethacrylic acid and Mn2+, respectively, increased after heating at 80°C for 1 week. We conclude that MA plays important roles on selective leaching to increase the amount of isolated Mn2+ ions, chemical interaction between ZnS:Mn and MA and energy transfer to Mn2+, leading to the increase in PL intensity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 452 , 1996 , 305
Copyright
Copyright © Materials Research Society 1997

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References

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